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　　工业循环水轧钢工业中占有非常重要位，其水温高低直接影响到加热炉和轧机等设备安全和使用寿命。为及时准确对循环水进行监控，莱钢轧钢厂中小型车间水处理采用浙大中控SUPCON JX—300X DCS控制系统。DCS控制系统把计算机、仪表和电控技术融合一起，实现了数据自动采集、处理、工艺画面显示、参数超限报警、设备故障报警和报表打印等功能。并此基础上开发了针对循环水温温度闭环控制。
　　2、系统介绍
　　SUPCON JX—300XDCS采用高速工业以太网Scnet作为其过程控制网络，系统由工程师站、操作站、控制站、过程控制单元等组成，配置灵活。水处理系统规模，水处理SUPCON DCS系统设计了1个控制站，1个操作站设置安全级别可兼做工程师站)，构成两级结构。控制站是现场级，直接与现场设备交换数据，完成整个工业过程实时监控功能。操作站(兼工程师站)是监督控制级，即可完成对系统组态、又可实现对现场级检测、控制、保护功能管理。SUPCON JX—300X DCS系统SCKey组态软件是一个全面支持该系统各类控制方案组态软件平台。 SCKey组态软件可完成整个系统控制站组态(系统I/O组态、控制方案组态等)、操作站组态(画面设置、系统流程图组态、系统报表组态等)。系统构成如图1所示。
　　3.1 方案设计
　　从生产热线循环回来工业水流入1#、2#吸水井散热，并吸水井塔顶1#和2#风机进行降温，然后1#、2#吸水井底部共用一个出水管为下一个工序供水，水温要求控制30oC以下。本系统吸水井出水管处安装Cu50热电阻对水温检测，把温度信号T1送入DCS处理器，控制规律运算后给出控制信号，控制变频器来改变电机输入电压频率，来改变电动机转速，带动风机降温，构成一个闭环温度控制系统。变频器选用两台日本SANKEN(300KW)通用型变频器，控制原理如图2所示。
　　循环水吸水井底部热交换特点，对1#、2#吸水井两台风机电机进行主/副控制，主/副电机不同速度曲线驱动风机运转。1#、2#电机可互为主/副电机选择，极大方便了操作工操作。
　　3.2 软件实现
　　为方便操作人员操作，操作站创建循环水温度监控画面，可线显示循环水温度、变频器速度反馈、报警等，进行1#、2#风机电机启停控制和主/副选择控制。并切换安全等级线修改主/副电机控制回路中温度、转速等控制参数。
　　针对循环水温度调节存大滞后性特点，对1#、2#风机电机采用分段控制方法，主/副电机控制曲线如图3所示：当循环水温度低于20oC时，主/副风机电机变频器输出电压频率均为20HZ。当循环水温度变高时，主控制回路中变频器输出电压频率跟随增大，当循环水温度高于24oC时，主电机全工频运转。副电机循环水温度升至23oC时，副控制回路增大副电机输入电压频率，提高风机转速，当循环水温度高于28oC时，副电机全工频运转，与主电机一起为循环水快速降温。

Schneider Telemecanique BMXP342020

RELEASE SuperMicro X9SRL-F MB ※Check W/ Us for Availability FIRST※

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SIEMENS Sinumerik Op. Panel 840D 1P-6FC5203-0AC02-0AA0

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Advantech UNO-2160-G1

ALLEN-BRADLEY 2711-B5A15X PANELVIEW OPERATOR INTERFACE PANEL NIB

ABB ACH401604132 3PH ADJUSTABLE FREQUENCY AC 50HP 480VAC 68A DRIVE B228528

Acterna JDSU Wavetek SDA-5000 CATV Analyzer w/ QAM Reverse Sweep SDA 5000

6ES7156-0AA01-0XA0 Brand , Factory Sealed,

8648B HP/Agilent Synthesized Signal Generator, 9kHz to 2000 MHz

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BALDOR VS1SP540-1B NSFP VS1SP5401B

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BAYSIDE PG142-004 USPP PG142004

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SIEMENS 6ES5 734-1BD20 Cable Assembly Great Condition

SIEMENS S5 6ES5 451-4UA12 6ES54514UA12 Digital

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Omron c200h-bc000-v1

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Schneider Modicon 115V AC Input Module Model AS-B351-001

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Schneider TELEMECANIQUE TSXSCP114 #3

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FANUC COMMUNICATIONS CONTROL MODULE IC693CMM311L MISSING FACE PLATE

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SIEMENS MOORE 16137-158 APACS QUADLOG CABLE ASSEMBLY ASSY CONNECTOR 26567

Allen-Bradley AB 1771-OFE1 Analog Output Module

ABB / CONTROL BOARD / DSQC326

AC TECHNOLOGY DL14030C USPP DL14030C

A06B-6057-H006 FANUC SERVO AMPLIFIER REMANUFACTURED

8 GS/s, 8 Mpt, Color, Math, Smart Triggers

SAGINAW D-56059 NSFP D56059

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Texas Instruments 5MT12-40AL

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TV One C2-8110 Corio2 6x2 DVI-U Seamless Switcher

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PWR-C45-2800ACV CATALYST 4500 2800W AC POWER SUPPLY W/INLINE POWER

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Allen-Bradley SLC 500 Output Module 1746-OW16 Ser C

Allen Bradley Rockwell Automation 3053-1000 Datamyte Operator Interface Panel

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OMRON Z500-SW17 NSFP Z500SW17

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ALLEN BRADLEY 1336S-B007-AA-EN-GM1-HA2-L6 USPP 1336SB007AAENGM1

GENERAL ELECTRIC DS200STBAG1ADC NSFP DS200STBAG1ADC

TAYLOR ELECTRONICS 6026BZ10400G USPP 6026BZ10400G

SQUARE D 8538-SEA21-V02S NSPP 8538SEA21V02S

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RSP720-3C-GE Cisco Route Switch Processor 720-3C Router

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Wago 750-585 2-CHANNEL ANALOG OUTPUT MODULE 0-20 mA Ex i

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REMOTE I/O ADAPTER MODULE 1771-ASB B 1771 ASB B 5V CNC ALLEN BRADLEY A-B

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ProSoft SLC 500 Generic ASCII Serial Communications Module MVI46-GSC

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AllenBradley2711-B6C10/C2711B6C10

Allen Bradley Terminal Keyboard 1770FD Alpha Numeric Overlay 1770-KAA 610715-01

ABB IRB120 M2004 IRC5 3KG Payload .58 Meter Low Hours 1 Phase Table Top Robot

ADVANTAGE ELECTRONICS 8410-BRP USPP 8410BRP

(Q7-6) 1 INDRAMAT MAC90C-2-KD-1-B/110-A-0/J625/S01 SERVO MOTOR Q7-6

MICROSWITCH LSH6A NSFP LSH6A

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GENERAL ELECTRIC 3N2100FA104C1 USPP 3N2100FA104C1

FANUC A20B-1003-0180 USPP A20B10030180

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Square D 8030 CRM-511

scca EFI-Tuners OBD-II CAN

Woodhead SST-PFB-CLX PROFIBUS Scanner for Allen-Bradley

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Schroff 20800-188

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Schneider Modicon AS-B838-032 | 12 mo. warranty | Free UK/EU Shipping | Price Inc UK VAT

MODICON 554VIC15739 OPERATOR INTERFACE INDUSTRIAL COMPUTER 554 VIC 15739 CDX 87

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SCHNEIDER TSX QUANTUM 140 CRA 931 00 RIO DROP S908 1 CH

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ALLEY BRADLEY 1745-PCC SLC PERSONAL COMPUTER INTERFACE CONVERTOR W/ CABLE SER A

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ABB BOARD DSQC 326

Adept Tech 30332-22350 SYSIO Floppy Hard Drive Module WOW

(3133) Fanuc Velocity Control Servo Control A06B-6047-H001 -NICE (3133)

INDRAMAT KDV1.3-100-220/300-W1/115/220 NSFP KDV13100220300W1

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KMC CONTROLS KMD-5221 USPP KMD5221

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Mercedes Benz Bluetooth Interface Phone Module Adapter

Xsigo VPE-MOD-10GE-1P Wired 10 Gigabit Ethernet Expansion Module for VP780 I/O

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Reliance 0-51851-5

Schneider Modicon AS-B258-101 O TO 10V ANALOG MERCURY RELAY

Schneider Modicon AS-B101-000 NSFP ASB101000

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Schneider Modicon AS-B237

Modicon Panelmate Plus Model PM+2000

SIEMENS SIMATIC S5 6ES5 421-8MA12 DIGITAL INPUT MODULE

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ACS400 Series ABB Inverter CPU Board SNAT4041C

ALLEN-BRADLEY 1794-OB16P FLEX I/O OUTPUT MODULE QTY

ABB ACH550-UH-072A-4 VARIABLE FREQUENCY AC 50HP 480V-AC 72A MOTOR DRIVE B225436

Acterna Wavetek MTS-5200e SM MM Fiber OTDR 5023 5026DR Color MTS5000 5200e 5026

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8890384 02 CO2 GAS ANALYZER JCT SAMPLE GAS DRYER JCM-E

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AVTRON A19359-1 NSPP A193591

MODICON AS-J212-001 USPP ASJ212001

ITE SIEMENS HNFC365J NSFP HNFC365J

CET MPC4 USPP MPC4

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Siemens 505-7202